Question 1

How many oxygen atoms are there in 5.00 g of sodium dichromate,Na2Cr2O7?

Accepted Answer

A)  0.133 oxygen atoms 
B)  1.64 × 1021 oxygen atoms 
C)  1.15 × 1022 oxygen atoms 
D)  8.04 × 1022 oxygen atoms 
A)  0.133 oxygen atoms 
B)  1.64 × 1021 oxygen atoms 
C)  1.15 × 1022 oxygen atoms 
D)  8.04 × 1022 oxygen atoms

Question 2

Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.

Accepted Answer

A)  2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g) 
B)  C2H6(g) + 5 O(g) → 2 CO(g) + 3 H2O(g) 
C)  2 C2H6(g) + 5 O2(g) → 4 CO(g) + 6 H2O(g) 
D)  C2H6(g) + 7 O(g) → 2 CO2(g) + 3 H2O(g) 
E)  2 CH3(g) + 5 O(g) → 2 CO(g) + 3 H2O(g) 
A)  2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g) 
B)  C2H6(g) + 5 O(g) → 2 CO(g) + 3 H2O(g) 
C)  2 C2H6(g) + 5 O2(g) → 4 CO(g) + 6 H2O(g) 
D)  C2H6(g) + 7 O(g) → 2 CO2(g) + 3 H2O(g) 
E)  2 CH3(g) + 5 O(g) → 2 CO(g) + 3 H2O(g)

Question 3

How many moles are there in 1.50 g of ethanol,CH3CH2OH?

Accepted Answer

A)  0.0145 mol 
B)  0.0326 mol 
C)  30.7 mol 
D)  69.0 mol 
A)  0.0145 mol 
B)  0.0326 mol 
C)  30.7 mol 
D)  69.0 mol

Question 4

Give the formula for potassium dichromate.

Accepted Answer

A)  KCrO  
B)  K2Cr2O7 
C)  K2CrO4 
D)  K2Cr2O6 
E)  KCr3O7 
A)  KCrO  
B)  K2Cr2O7 
C)  K2CrO4 
D)  K2Cr2O6 
E)  KCr3O7

Question 5

K2S is named

Accepted Answer

A)  potassium disulfide. 
B)  potassium sulfide. 
C)  potassium(II) sulfide. 
D)  potassium sulfur. 
A)  potassium disulfide. 
B)  potassium sulfide. 
C)  potassium(II) sulfide. 
D)  potassium sulfur.

Question 6

Determine the name for Br2O.

Accepted Answer

A)  bromine oxide 
B)  dibromine monoxide 
C)  bromine(I) oxide 
D)  bromine(II) oxide 
E)  bromate 
A)  bromine oxide 
B)  dibromine monoxide 
C)  bromine(I) oxide 
D)  bromine(II) oxide 
E)  bromate

Question 7

Write the formula for copper (II)sulfate pentahydrate.

Accepted Answer

A)  Cu2SO3∙H5 
B)  Cu2S∙H2O 
C)  CuS∙5H2O 
D)  (CuSO4)5 
E)  CuSO4∙5H2O 
A)  Cu2SO3∙H5 
B)  Cu2S∙H2O 
C)  CuS∙5H2O 
D)  (CuSO4)5 
E)  CuSO4∙5H2O

Question 8

Write the name for Sn(SO4)2.Remember that Sn forms several ions.

Accepted Answer

A)  tin(I) sulfite 
B)  tin(IV) sulfate 
C)  tin sulfide 
D)  tin(II) sulfite 
E)  tin(I) sulfate 
A)  tin(I) sulfite 
B)  tin(IV) sulfate 
C)  tin sulfide 
D)  tin(II) sulfite 
E)  tin(I) sulfate

Question 9

How many cations are there in 30.0 g of sodium phosphate?

Accepted Answer

A)  1.10 × 1023 cations 
B)  3.31 × 1023 cations 
C)  3.29 × 1024 cations 
D)  9.87 × 1024 cations 
E)  6.50 × 1024 cations 
A)  1.10 × 1023 cations 
B)  3.31 × 1023 cations 
C)  3.29 × 1024 cations 
D)  9.87 × 1024 cations 
E)  6.50 × 1024 cations

Question 10

Describe the difference between ionic and molecular compounds.Give an example of each.

Accepted Answer

An ionic compound is formed between a me

Question 11

The compound ClO is named

Accepted Answer

A)  chlorite. 
B)  hypochlorite. 
C)  chlorine monoxide. 
D)  chlorine (II) oxide. 
A)  chlorite. 
B)  hypochlorite. 
C)  chlorine monoxide. 
D)  chlorine (II) oxide.

Question 12

Describe the difference between a molecular formula and an empirical formula.Give an example.

Accepted Answer

A molecular formula is the exact number

Question 13

Determine the empirical formula for a compound that is found to contain 10.15 mg P and 34.85 mg Cl.

Accepted Answer

A)  P3Cl 
B)  PCl 
C)  PCl2 
D)  P2Cl3 
E)  PCl3 
A)  P3Cl 
B)  PCl 
C)  PCl2 
D)  P2Cl3 
E)  PCl3

Question 14

An aqueous solution of HI is named

Accepted Answer

A)  hydroiodic acid. 
B)  hydroiodous acid. 
C)  iodic acid. 
D)  iodous acid. 
A)  hydroiodic acid. 
B)  hydroiodous acid. 
C)  iodic acid. 
D)  iodous acid.

Question 15

A sample of pure lithium nitrate contains 7.99% lithium by mass.What is the % lithium by mass in a sample of pure lithium nitrate that has twice the mass of the first sample?

Accepted Answer

A)  4.00% 
B)  7.99% 
C)  16.0% 
D)  32.0% 
A)  4.00% 
B)  7.99% 
C)  16.0% 
D)  32.0%

Question 16

Give the formula for plumbous phosphate.

Accepted Answer

A)  Pb3(PO4)2 
B)  Pb2(PO4)3 
C)  PbPO4 
D)  Pb3(PO3)4 
E)  Pb3(PO4)4 
A)  Pb3(PO4)2 
B)  Pb2(PO4)3 
C)  PbPO4 
D)  Pb3(PO3)4 
E)  Pb3(PO4)4

Question 17

Determine the molecular formula of a compound that is 49.48% carbon,5.19% hydrogen,28.85% nitrogen,and 16.48% oxygen.The molecular weight is 194.19 g/mol.

Accepted Answer

A)  C8H12N4O2 
B)  C4H5N2O 
C)  C8H10N4O2 
D)  C8H10N2O 
A)  C8H12N4O2 
B)  C4H5N2O 
C)  C8H10N4O2 
D)  C8H10N2O

Question 18

Which of the compounds,NaH ,PH3,CH4,IBr3 are ionic compounds?

Accepted Answer

A)  only CH4 
B)  only NaH  
C)  Na H and PH3 
D)  PH3, CH4, and IBr3 
A)  only CH4 
B)  only NaH  
C)  Na H and PH3 
D)  PH3, CH4, and IBr3

Question 19

Write the name for SnS.

Accepted Answer

A)  stannous sulfate 
B)  stannous sulfide 
C)  stannic sulfide 
D)  stannic sulfate 
E)  tin sulfide 
A)  stannous sulfate 
B)  stannous sulfide 
C)  stannic sulfide 
D)  stannic sulfate 
E)  tin sulfide

Question 20

Determine the name for HIO3.

Accepted Answer

A)  hydroiodic acid 
B)  hydroiodus acid 
C)  iodate acid 
D)  iodic acid 
E)  periodic acid 
A)  hydroiodic acid 
B)  hydroiodus acid 
C)  iodate acid 
D)  iodic acid 
E)  periodic acid

Exam 3: Molecules,compounds,and Chemical Equations

How many oxygen atoms are there in 5.00 g of sodium dichromate,Na2Cr2O7?

Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.

How many moles are there in 1.50 g of ethanol,CH3CH2OH?

Give the formula for potassium dichromate.

K2S is named

Determine the name for Br2O.

Write the formula for copper (II)sulfate pentahydrate.

Write the name for Sn(SO4)2.Remember that Sn forms several ions.

How many cations are there in 30.0 g of sodium phosphate?

Describe the difference between ionic and molecular compounds.Give an example of each.

The compound ClO is named

Describe the difference between a molecular formula and an empirical formula.Give an example.

Determine the empirical formula for a compound that is found to contain 10.15 mg P and 34.85 mg Cl.

An aqueous solution of HI is named

A sample of pure lithium nitrate contains 7.99% lithium by mass.What is the % lithium by mass in a sample of pure lithium nitrate that has twice the mass of the first sample?

Give the formula for plumbous phosphate.

Determine the molecular formula of a compound that is 49.48% carbon,5.19% hydrogen,28.85% nitrogen,and 16.48% oxygen.The molecular weight is 194.19 g/mol.

Which of the compounds,NaH ,PH3,CH4,IBr3 are ionic compounds?

Write the name for SnS.

Determine the name for HIO3.

Matter, measurement, and Problem Solving

Atoms and Elements

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes,valence Bond Theory,

Liquids,solids,and Intermolecular Forces

Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

How many oxygen atoms are there in 5.00 g of sodium dichromate,Na₂Cr₂O₇?

How many moles are there in 1.50 g of ethanol,CH₃CH₂OH?

K₂S is named

Determine the name for Br₂O.

Write the name for Sn(SO₄)₂.Remember that Sn forms several ions.

The compound ClOis named

Which of the compounds,NaH,PH₃,CH₄,IBr₃ are ionic compounds?

Determine the name for HIO₃.